Jc Scaling and Anisotropies in Co-doped Ba-122 thin films

TL;DR

This study reports the growth and characterization of epitaxial Co-doped Ba-122 thin films, revealing low anisotropy and specific vortex pinning properties, contributing to understanding their superconducting behavior.

Contribution

It provides new insights into the anisotropic properties and vortex pinning mechanisms of Co-doped Ba-122 thin films, with detailed structural and electromagnetic analysis.

Findings

Epitaxial, superconducting Ba-122 films grown without correlated defects.

Low anisotropic behavior in Jc({ heta}) and Hc2 compared to cuprates.

Temperature-dependent electronic mass anisotropy observed.

Abstract

We have successfully grown epitaxial, superconducting films of Ba(Fe1-xCox)2As2 (Ba-122)with x ~ 0.1. The films grow without observable correlated defects parallel to the c-axis, as confirmed by TEM. This is also reflected in the absence of a caxis peak in Jc({\theta}). In contrast to cuprate high-Tc superconductors such as YBa2Cu3O7-d or even Bi2Sr2Ca2Cu3O10-d, the pnictides show a rather low anisotropic behavior in their Jc({\theta}) behavior as well as in their upper critical fields, Hc2. As a multiband superconductor, Ba-122 exhibits a temperature dependent electronic mass anisotropy.